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| Study on the chemical chain combustion reactivity of copper-iron composite oxygen carrier prepared by Bayan Obo iron ore concentrate and CuO |
| HAN Aimin1, SUI Zifeng1, ZHANG Pengfei1, WANG Qihao1, Lü Qinggang2, CHEN Weipeng1 |
| （1. School of Energy Resources and Environment ,Inner Mongolia University of Science and Technology， Baotou 014010,China； 2. Bao Gang United Steel, Inner Mongolia, Baotou 014010,China） |
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Abstract Bayan obo iron ore, coexisting with multiple valuable minerals such as iron and rare earth elements, ex‐ hibits high reactivity, abundant resources, and low cost. By employing the calcination synthesis method, a mixture of this ore with copper oxide is prepared into a spinel CuFe2O4 oxygen carrier, aiming to develop a performance-op‐ timized, cost-effective, and environmentally friendly oxygen carrier for chemical looping combustion. The reduc‐ ibility and cyclic stability of the oxygen carrier were investigated through thermogravimetric analysis and small fixed-bed experiments, complemented by XRD characterization for an in-depth analysis of reaction characteristics and mechanisms. The results demonstrate that the addition of copper significantly enhances the activity of the iron concentrate oxygen carrier, improves the high-temperature resistance and anti-sintering stability of the copper ox‐ ide oxygen carrier, and forms a more stable spinel structure of CuFe2O4, exhibiting excellent synergistic effects. The CO program warming test illustrated that the reduction reaction of the copper-iron composite oxygen carrier primarily involves CuFe2O4, proceeding in three stages: in the first stage, CuFe2O4 is reduced to Cu and Fe3O4 at low temperatures with the highest reactivity; the second and third stages involve the reduction of Fe3O4 to FeO and then FeO to Fe, respectively. During 26 reduction-oxidation cycles, the CuFe900 oxygen carrier displayed no sig‐ nificant sintering, maintaining good reactivity and cyclic stability.
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Received: 10 February 2023
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Corresponding Authors:
陈伟鹏 （1974—）， 男， 硕士， 副教授， 主要研究方向为化学链燃烧及高效洁净燃烧技术。
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2024, Vol. 34 
